- A
Create an IAM role for the Lambda function with permissions to use RDS IAM database authentication.
IAM database authentication allows passwordless access using IAM roles.
- B
Place the Lambda function in the same VPC as the RDS instance to avoid traversing the internet.
This ensures traffic stays within the AWS network and can use security groups.
- C
Store the database credentials in the Lambda environment variables.
Why wrong: Storing credentials in environment variables is less secure than using Secrets Manager or IAM database authentication.
- D
Use the database master user account for the Lambda function.
Why wrong: Master user should not be used for application access; create a dedicated user with minimal privileges.
- E
Attach a NAT gateway to the Lambda function's VPC for outbound internet access.
Why wrong: NAT gateway is not required for accessing RDS within the same VPC.
Quick Answer
The correct answer is to place the Lambda function in the same VPC as the RDS instance and attach an IAM role with least privilege permissions. By deploying the Lambda function within the same Virtual Private Cloud, traffic to the RDS MySQL database stays entirely on the AWS network, avoiding the public internet and eliminating the need for a NAT gateway. This configuration leverages VPC security groups to control traffic at the network layer, while the IAM role ensures the function only has the minimal database actions required, preventing credential exposure. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of combining network isolation with identity-based access control—a common trap is assuming Lambda environment variables or the master user are acceptable for secure access. Remember the mnemonic “Same VPC, Least IAM” to recall that secure Lambda access to RDS MySQL requires both network containment and granular permissions, never hardcoded credentials or elevated database roles.
DBS-C01 Database Security Practice Question
This DBS-C01 practice question tests your understanding of database security. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company uses an Amazon RDS for MySQL DB instance that needs to be accessed by a Lambda function. Which TWO steps should be taken to ensure secure access?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Create an IAM role for the Lambda function with permissions to use RDS IAM database authentication.
Options B and D are correct. Placing the Lambda function in the same VPC and using an IAM role with least privilege are security best practices. Option A is wrong because storing credentials in Lambda environment variables is not secure. Option C is wrong because using the database master user for Lambda is insecure. Option E is wrong because a NAT gateway is not needed for RDS access within the same VPC.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Create an IAM role for the Lambda function with permissions to use RDS IAM database authentication.
Why this is correct
IAM database authentication allows passwordless access using IAM roles.
Related concept
Authentication checks who the user is.
- ✓
Place the Lambda function in the same VPC as the RDS instance to avoid traversing the internet.
Why this is correct
This ensures traffic stays within the AWS network and can use security groups.
Related concept
Authentication checks who the user is.
- ✗
Store the database credentials in the Lambda environment variables.
Why it's wrong here
Storing credentials in environment variables is less secure than using Secrets Manager or IAM database authentication.
- ✗
Use the database master user account for the Lambda function.
Why it's wrong here
Master user should not be used for application access; create a dedicated user with minimal privileges.
- ✗
Attach a NAT gateway to the Lambda function's VPC for outbound internet access.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
- Authentication checks who the user is.
- Authorization controls what the user is allowed to do after login.
- Privilege levels affect access to EXEC and configuration commands.
- AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
- Do not assume successful login means full administrative access.
- Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
- Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related DBS-C01 questions on access control and AAA configuration.
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Database Security — study guide chapter
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
Database Security — This question tests Database Security — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Create an IAM role for the Lambda function with permissions to use RDS IAM database authentication. — Options B and D are correct. Placing the Lambda function in the same VPC and using an IAM role with least privilege are security best practices. Option A is wrong because storing credentials in Lambda environment variables is not secure. Option C is wrong because using the database master user for Lambda is insecure. Option E is wrong because a NAT gateway is not needed for RDS access within the same VPC.
What should I do if I get this DBS-C01 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related DBS-C01 questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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Last reviewed: Jun 20, 2026
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